What is that one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b). protoxide of nitrogen, laughing gas, now called hyponitrous oxideNO. See under Laughing called?

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protoxide — That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b). protoxide of nitrogen, laughing gas, now called hyponitrous oxideNO. See under Laughing. (Webster's 1913.)

What is that one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b). protoxide of nitrogen, laughing gas, now called hyponitrous oxideNO. See under Laughing called?

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